71905 ACD/P4ADGC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71905 ACD/P4ADGC
Basic Information
System of measurement
Metric
Weight
0.084 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.004mm to 0
Width
18 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2340 lbf
Radial static load rating
1721 lbf
Limiting speed
53 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71905 ACD/P4ADGC Bearing Product Overview & Core Advantages
The 71905 ACD/P4ADGC is a precision angular contact ball bearing designed for demanding applications requiring high rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-set pair, it is engineered to accommodate combined loads—simultaneously handling significant radial and axial forces. Its P4A tolerance class ensures exceptional dimensional and running accuracy, making it ideal for high-speed spindles and other high-precision machinery. The phenolic cage and optimized 25° contact angle contribute to its superior high-speed performance and operational stability.
71905 ACD/P4ADGC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71905 ACD/P4ADGC provides a detailed technical specification through its suffixes:
- 71905: Basic series designation for a high-precision, light-series angular contact ball bearing.
- AC: Angular Contact design with a 25° contact angle.
- D: Indicates a Moderate Preload (Class C) applied to the bearing set.
- P4A: Denotes an ultra-precision tolerance class, exceeding ABEC 7/ISO P4 standards for exceptional running accuracy.
- DGC: Specifies that the bearings are supplied as a Universal Matchable (SU) pair, pre-configured in a DB (back-to-back) arrangement for immediate installation and optimal performance.
71905 ACD/P4ADGC Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The universal matchable pair in a back-to-back arrangement creates a highly rigid bearing system that effectively resists moment loads and accommodates combined radial and axial loads from both directions.
- Superior High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, while the 25° contact angle provides an excellent balance between axial load capacity and speed capability, enabling a high limiting speed.
- Precision Operation: Manufactured to a P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for applications requiring extreme rotational accuracy.
- Optimized Internal Geometry: Featuring 18 precision balls and a optimized raceway design, the bearing ensures smooth operation, reduced heat generation, and extended service life.
71905 ACD/P4ADGC Bearing Typical Application Areas
The 71905 ACD/P4ADGC is ideally suited for high-performance applications where precision and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Medical Equipment: Dental handpieces, centrifuges, and scanner gantries.
- Aviation & Aerospace: Gyroscopes, navigation systems, and auxiliary power units.
- High-Frequency Motors and Spindles: Where low vibration and high running accuracy are required.
